New Post: Undeploy in TFS build failing build when not deployed

I have been giving a new requirement for my TFS automated builds that use BTDF, they want me to undeploy all the application before I build, I have added a call to MSBuild that used /t:undeploy and that works, except when the application is not deployed it throws an error in the build and the build fails. is it possible to override the error being thrown and just stop the undeploy if it is not deployed?

Thanks,

Bill